The electrochemical cell stops working after some time because:

Options

A. Electrode potential of both the electrodes becomes zero
B. Electrode potential of both the electrodes becomes equal
C. One of the electrode is eates away
D. The cell reaction gets reversed

Answer

B

Explanation

In electrochemical cell, potential difference is created. Cathode is at higher potential and anode is at lower potential.current flows due to potential difference, from higher potential to lower potential. The electrochemical cell stops working when potential difference is zero i.e.,both the electrode potential becomes equal.